Unblock Exchange 2013 attachments

I have a new Exchange 2013 standard server and need to be able to unblock .mht files in the OWA interface.  I have tried the following commands in the Exchange Management Shell but the attachments appear to still be blocked:

Set-OwaMailboxPolicy -BlockedFileTypes @(Remove = ".mht")
Set-OwaMailboxPolicy -BlockedFileTypes @(Remove = ".mhtml")
Set-OwaMailboxPolicy -Identity Default -AllowedFileTypes '.mht'
Set-OwaMailboxPolicy -Identity Default -AllowedFileTypes '.mhtml'
David BarmanAsked:
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Have your tried zipping them?

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David BarmanAuthor Commented:
I'd rather not zip them. Users want to open attachments on ipads and smartphones
So far what i have found out its by design, even if that file extension is in allowed list....
but you can try the suggestions in below link for EMC and OWA and see if it works for you...
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David BarmanAuthor Commented:
It looks like that link is for Exchange 2010. I have 2013.
steps wont be much of a difference, if you follow them......
David BarmanAuthor Commented:
I will zip files to work around the issue
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